Greylite works on UNIX.
You can spare time if a greylite package exists for your OS' package manager.
Greylite can be combined with several tunings for improving its effectiveness.
| upstream server | tuning suspicion | effectiveness | time required |
|---|---|---|---|
| qmail | no | about 70 % | about 10 mins |
| qmail | yes | 99+ % | 1 hour |
| any SMTP | no | about 70 % | 15 mins |
| any SMTP | yes | 99+ % | 1 hour |
This is a rough estimate including the time required to follow/learn the documentation and excluding the time for providing dependencies. Installing from package managers can significantly reduce these timings.
Greylite works in a modular fashion similarly to qmail.
It can be interfaced directly to qmail in its module chain, or it can
equivalently be used with any SMTP server in the guise of a
greylisting proxy
.
In either case, greylite has some requirements you should fulfill before installing.
The installation is documented separately for each type for simplicity:
See test greylite.
The basic setup usually reduces SPAM by 70% or more. Using a suspicion ruleset usually reduces SPAM by 99% or more.
The greylisting delay can be more effectively cut for large mailserver networks.